Tubular metallic post



(No Model.)`

W. & C. ANDREW. TUBULAR METALLIG POST.

Patented Mey 8, 1894.

@Minn STATES 1 PATENT Critics.

WILLIAM ANDREW AND CHARLS ANDREW, OF CINCINNATI, OHIO.

TUBULAR METALLIC POST.'Y

SPECIFICATION forming part of Letters Patent No. 519,311, dated May 8, 1894. ippiicaam nea rune 26,1893. serai No. 478.366. (Numan.)

To all whom t may concern,.- ing ajointure with an upper contraction joint. Be it known that we, WILLIAM ANDREW Fig. 3, is a detail showing, at the left hand, an and CHARLES ANDREW, citizens of the United exterior view of a split pipe internally thread- 55 States, residing at Cincinnati, Ohio, have ined; centrally, an axial cross section of the 5 vented new andusefulImprovementsinTubu# same, and at the right hand, the end of the lar .Metallic Posts, of which the following is split pipe externally threaded. Fig. 4, is aA a specification. cross section of the expanding plug of Fig. l,

- Our invention relates to sectional tubular and Fig. 5, is an external view ot' a joint made 6o metallic posts employed for various purposes, by contracting the outer pipe at a point inter-v ro such, for example, assupporting electric conmediate between the ends, by means of the ducting wires for electric street railways, elecouter .conical screw ring and an interposed tric light circuits', lines of piping, &c.,`in cities split screw ring. and elsewhere; its object being to produce a Referring now to the drawings: A, and, B, 65 simple, cheap, and efficient post of this type, designate, respectively, the larger and smaller 15 which can be transported in sections-and put tubes,-the latter being telescoped into the together and set up with ordinary portable former a sufficient distance to produce the appliances where used. requisite lateral strength. In the form ot' "o this end, it consists in ajoint for posts joint shown in Fig. l, the lower end of the 7o consisting of tubes telescoped one withinthe inner tube, B, is threaded interiorly .for a` zo other, the joint being formed by compression short distance upward, and is'cut through by or expansion, as the case may be, of one tube longitudinal slits, b, as indicated more clearly against the other, by means of a conical screw in the detail Fig. 3. Where the tubes differ acting upon a threaded portion of the pipe materially in diameter, a ring, C, or bushing, `7 5 longitudinally, split at intervals to permit the slit at one side parallel to its axis to allow exz 5 desired expansion or contraction. Where the pansion, is provided for the lower end of the inner pipe is to be expanded against the outer inner tube. The bushing may also be propipe, the former is internally threaded at its vided with a slight ledge, c, projecting in-- end to admit a conical screw-plug and the wardly at its lower edge, as a seat to the pipe. Se pipe slit inward `from the end by a series of The tubes, A, B, and bushing, C, being 3o longitudinal slits to permit its ready expanplaced in the relation shown in Fig. l, an exsion. Where the outer pipe is to be companding plug, D, slightly conical and extepressed upon the inner one, these conditions riorly threaded to engage the threads of the are reversed, namely: the outer pipe,provided tube, B, (and further provided with a squared 85 with the slits,is externally threaded to admit aperture or'with a depression, d, for the in- 3 5 a conical screw-ring upon the outside, by sertion of a rotating tool in the nature of an which it is compressed upon the inner pipe, enlarged screw driver) is inserted in the lower In some cases, where it is desirable to make end of the tube, B, and screwed home, thereby the joint at an intermediate point, where expandingthe inner tube and bushing against 9o the end of the pipe cannot be conveniently the outer tube, A. The expansion is facili- 4o reached, the outer pipe may be compressed tated by the slitting et the tube at, b.

upon the inner by longitudinally slitting the The upper ring, E, indicated in.' Fig. 1, is outer pipe at a given zone and surrounding simply a plain split ring driven in as a bushthe pipe at such zone with a split ringextering. In placing the parts together in the iirst 9 5 nally threaded and screwing thereon a solid instance, the ring, C, is first placed upon the I45 ring internally conical and threaded. lower end of the tube, B, as far as permitted Mechanism embodying our invention is by the ledge, c, the plug, D, inserted far illustrated in the accompanying drawings, in enough to engage, and the tube, B, is then whichinserted in the upper end ot the tube, A, and me j Figure l, is a vertical axial section of the telescoped inward to its position carrying the 5o post showing a jointure of two pipes differing ring, C, with it by means of theledge, The i considerably in diameter, withalower expanring, E, which may have a slightly Wedge sion joint. Fig. 2, is a similar section show` shaped cross section, is then slipped over the upper end of the tube, B, and driven to its position, as shown in Fig. l, to form an annular bushinginterposed between the two tubes. The plug, l), is then rotated and thus screwed into the slit end of the inner tube, expanding the same as described, and as permitted by the slits, b.

When the lower fastening is completed, the upper annular wedge, E, is driven nally home; and, if desired, the usual cap-piece, H, may be used to protect all parts from the Weather. The upper joint may, however, be formed in a substantially similar manner as the lower, applied' in reverse, that is to say: the upper end of the outer tube may be threaded exteriorly and slit, as shown in the detail at the right of Fig. y3; and a ring, F, with threaded conical interior opening is then engaged upon it from above. In Fig. 3 the tubes are shown of a relative size to require no bushing. The same general method of effecting the union of the tubes may be applied with a slight modification, as shown in Fig. 5, when the tubes can be reached only from the outside at a point remote from the ends. In this case, the outer tube is slit as indicated at, b', across the desired zone of compression; and l a slit bushing, G, externally threaded and slightly conical, is placed upon it at said zone. The conical screw ring, F, is then slipped over the pipes and screwed down upon the bushing, G, which is meantime held from rotating; and the tube, A, thereby compressed upon the inner pipe, B.

By the method of jointing thus described,

there is formed a cheap and perfectlysecure I jointing of the tubes, such as adapts them to be put together when delivered upon the ground, and enables them therefore to be readily handled in sectional parts for transportation. The joint is also easily taken apart by a reversal ofthe process of putting together, and by the same or similar appliances.

The machine work required, is confined to the cutting of the screw threads and slitting of the tubes; both of which operations are very readily aud inexpensively performed by the ordinary appliances of the machine shop.

We claim as our invention and desire to secure by Letters Patent of the United Statesl. A metallic post embodying sections of tubing` telescoped one within the other, one

of said tubes being screw-threaded and longitudinally slitted at its end, and forced and held against the other tube by a correspondingly screw threaded gaging the threads at the end of the slitted tube, substantially as set forth.

2. A tubular metallic post embodying in combination, an outer tube: an inner tube, interiorly threaded and longitudinally slit at its lower end; and a conical screw-threadedplug, screwed into the lower end of the inner section, thereby expanding the same against the outer tube, substantially as set forth.

In testimony whereof We have hereunto set our hands in the presence of two subscribing witnesses.

WILLIAM ANDREW. CHARLES ANDREW.

Witnesses:

L. M. HosEA, LANDON FREYBLER.

conical plug or ring en- 

